COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2015

COMMITMENTS AND CONTINGENCIES [Abstract]

Commitments Due

	Unconditional
	Purchase
in thousands	Obligations
Property, Plant & Equipment
2016	$        67,560
Thereafter	79,304
Total	$      146,864
Noncapital (primarily transportation and electricity contracts)
2016	$        14,361
2017–2018	17,564
2019–2020	11,677
Thereafter	5,000
Total	$        48,602

Minimum Royalties Under Mineral Leases

	Mineral
in thousands	Leases
Minimum Royalties
2016	$        21,479
2017–2018	37,710
2019–2020	25,380
Thereafter	132,811
Total	$      217,380